Red-eye effect
Red-eye effect
The Red-eye effect (/ˈrɛdˌaɪ ɪˈfɛkt/) is a common phenomenon in photography where the subject's eyes appear red in color in the photograph. This effect is typically observed when using a flash in low-light conditions.
Etymology
The term "Red-eye effect" is derived from the appearance of the subject's eyes in the photograph. The red color is caused by the reflection of light from the retina, which is rich in blood vessels and hence appears red.
Cause
The Red-eye effect is caused by the reflection of light from the retina of the eye. When a flash is used in low-light conditions, the pupils are dilated to allow more light to enter the eye. The sudden bright flash causes the light to reflect off the retina before the pupils have a chance to constrict, resulting in the red-eye effect.
Prevention and correction
Many modern digital cameras and smartphones have built-in red-eye reduction features that work by emitting a pre-flash to cause the subject's pupils to constrict before the actual flash and photograph are taken. Additionally, many photo editing software programs have tools that can be used to correct the red-eye effect in photographs after they have been taken.
Related terms
- Flash (photography): A device used in photography producing a flash of artificial light to help illuminate a scene.
- Retina: The light-sensitive layer of tissue at the back of the inner eye.
- Pupil: The opening in the iris of the eye that allows light to reach the retina.
- Digital camera: A camera that captures photographs in digital memory.
- Smartphone: A mobile device that combines cellular and mobile computing functions into one unit.
- Photo editing software: Software designed to edit pictures on a computer.
External links
- Medical encyclopedia article on Red-eye effect
- Wikipedia's article - Red-eye effect
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